Hybrid Automatic Repeat Request Feedback in Radio Systems

1. A method comprising: receiving a sidelink control information, scheduling a transport block, wherein the transport block indicates a first repetition value; receiving the transport block; transmitting an acknowledgment for the received transport block based on a comparison of the first repetition value and a repetition threshold, wherein the repetition threshold is received via at least one radio resource control messages, wherein the at least one radio resource control messages comprise configuration parameters, wherein the configuration parameters indicate at least one radio resource; and transmitting the acknowledgment for the received transport block.

2. The method of claim 1, wherein the transmitting occurs when the first repetition value is equal to or less than the repetition threshold.

3. The method of claim 1, wherein a plurality of repetition values comprises the first repetition value, wherein each of the plurality of repetition values indicates a plurality of repetition transmissions of the physical sidelink shared channel.

4. The method of claim 3, wherein the plurality of repetition values of the physical sidelink shared channel comprise transmission and retransmissions of the physical sidelink shared channel with different redundancy versions.

5. The method of claim 4, wherein the different redundancy versions are indicated to a device via the sidelink control information.

6. The method of claim 1, wherein the repetition threshold for the physical sidelink shared channel comprises a repetition value for a transmission sent to the wireless device.

7. The method of claim 1, wherein the receiving the sidelink control information comprises receiving the sidelink control information from a reception resource pool.

8. The method of claim 1, wherein the transport block is received via a sidelink.

9. The method of claim 1, wherein the at least one radio resource control messages are received from at least one of a base station and a second wireless device.

10. The method of claim 1, wherein the at least one radio resource comprises at least one radio resource pool.

11. A computer program stored on a non-transitory medium, wherein the computer program when executed on a processor performs the method as claimed in claim 1.

12. A device comprising: at least one processors; and a memory, wherein the memory is arranged to store instructions wherein the at least one processor is arranged to receive a sidelink control information, wherein the at least one processor is arranged to schedule a transport block, wherein the transport block indicates a first repetition value, wherein the at least one processor is arranged to receive the transport block, wherein the at least one processor is arranged to transmit an acknowledgment for the received transport block based on a comparison of the first repetition value and a repetition threshold, wherein the repetition threshold is received via at least one radio resource control messages, wherein the at least one radio resource control messages comprise configuration parameters, wherein the configuration parameters indicate at least one radio resource, wherein the at least one processor is arranged to transmit the acknowledgment for the received transport block.

13. The device of claim 12, wherein the transmitting occurs when the repetition threshold, is based on the first repetition value is equal to or less than the repetition threshold.

14. The device of claim 12, wherein a plurality of repetition values comprises the first repetition value, wherein each of the plurality of repetition values indicates a plurality of repetition transmissions of the physical sidelink shared channel.

15. The device of claim 14, wherein the plurality of repetition values of the physical sidelink shared channel comprise transmission and retransmissions of the physical sidelink shared channel with different redundancy versions.

16. The device of claim 15, wherein the different redundancy versions are indicated via the sidelink control information.

17. The device of claim 12, wherein the repetition threshold for the physical sidelink shared channel comprises a repetition value for a transmission sent to the device.

18. The device of claim 12, wherein receiving the sidelink control information comprises receiving the sidelink control information from a reception resource pool.

19. The wireless device of claim 12, wherein the transport block is received via a sidelink.

20. The method of claim 12, wherein the at least one radio resource control messages are received from at least one of a base station and a second device.

21. The device of claim 12, wherein the at least one radio resource comprises at least one radio resource pool.